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快速有效的促晶方法是实现气体水合物蓄冷技术的关键.从增大一氟二氯乙烷(HCFC141b)和水的互溶度和相界面出发,制备了HCFC141b微乳液,对比研究了HCFC141b微乳液和HCFC141b/水粗混合体系中的HCFC141b水合反应诱导时间和过冷度,分析了水合物生长特征;在此基础上利用纳米粒子强化传热的特点,考察了混合体系中添加纳米Cu粒子和纳米Al2O3粒子对水合反应的影响.结果表明,微乳液体系内快速均匀地生成大量水合物晶体,水合反应诱导时间比在乳浊液和不含表面性剂的粗混合体系中分别缩短36%和52%.将纳米粒子加入微乳液体系可降低反应过冷度,但是对粗混合体系和乳浊液中的反应过冷度无影响.微乳液体系内添加0.1wt%纳米Cu粒子后水合反应诱导时间缩短29%,过冷度降低39%.将微乳液体系和纳米粒子相结合形成的纳米流体可有效促进制冷剂气体水合物的生成.
The rapid and effective crystallization-promoting method is the key to the gas hydrate storage technology.From increasing the mutual solubility and phase interface of HCFC141b and water, the HCFC141b microemulsion was prepared and compared with the HCFC141b microemulsion And HCFC141b HCFC141b HCFC141b reaction induction time and undercooling, hydrate growth characteristics; based on the use of nano-particles to enhance the heat transfer characteristics were investigated in the mixed system to add nano-Cu particles and nano Al2O3 particles on the hydration reaction.The results show that a large number of hydrate crystals are formed rapidly and uniformly in the microemulsion system and the induction time of the hydration reaction is shortened by 36% and 52% respectively compared with that in the emulsion and surfactant-free crude mixed system % .The addition of nano-particles to the microemulsion system can reduce the reaction supercooling degree, but has no effect on thecooling degree of the reaction in the crudemixture system and the emulsion.With the addition of 0.1wt% nano-Cu particles in the microemulsion system, the hydration reaction induction time Shortened by 29% and decreased the degree of undercooling by 39% .The nanofluid formed by combining the microemulsion system and nanoparticles can effectively promote the formation of gas hydrate in the refrigerant.